From: Brad Campbell <lists2009@fnarfbargle.com>
To: Justin Piszcz <jpiszcz@lucidpixels.com>,
open list <linux-kernel@vger.kernel.org>,
linux-raid@vger.kernel.org
Subject: Re: 3.12: raid-1 mismatch_cnt question
Date: Tue, 12 Nov 2013 08:39:20 +0800 [thread overview]
Message-ID: <528178B8.4000704@fnarfbargle.com> (raw)
In-Reply-To: <CAO9zADxbiW_OBiewAY8JQQjxS51Ydrm8Rj1=MWXCA+Xo9K3=2Q@mail.gmail.com>
On 11/07/2013 06:54 PM, Justin Piszcz wrote:
> On Mon, Nov 4, 2013 at 5:25 AM, Justin Piszcz <jpiszcz@lucidpixels.com> wrote:
>> Hi,
>>
>> I run two SSDs in a RAID-1 configuration and I have a swap partition on a
>> third SSD. Over time, the mismatch_cnt between the two devices grows higher
>> and higher.
>>
Are both SSD's identical? Do you have discard enabled on the filesystem?
The reason I ask is I have a RAID10 comprised of 3 Intel and 3 Samsung
SSD's. The Intel return 0 after TRIM while the Samsung don't, so I
_always_ have a massive mismatch_cnt after I run fstrim. I never use a
repair operation as it's just going to re-write the already trimmed sectors.
Just a thought.
next prev parent reply other threads:[~2013-11-12 1:12 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-04 10:25 3.12: raid-1 mismatch_cnt question Justin Piszcz
2013-11-07 10:54 ` Justin Piszcz
2013-11-12 0:39 ` Brad Campbell [this message]
2013-11-12 9:14 ` Justin Piszcz
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